This is not a pure open source project, because we plan a commercial part in it, but the topic may be interesting for you. This is a web learning platform, focused on effective learning using spaced repetition technique. Technologies: Python/Pylons/SQLAlchemy + Ext JS. TDD and Agile techniques. We need a skilled developer who have some time to invest.

Since the the subject is that of a maintainer for an existing project. I would suggest that some of the python code metrics efforts could use a little love. PyMetrics (http://sourceforge.net/projects/pymetrics/) is an obvious canidate. Little maintenance has been done recently as far as I can tell. With the transition to python 3.0 coming up an overall update to the metrics programs would be nice.

I know that sqlalchemy-migrate could use a maintainer. Right now it only supports sa 0.4.5 and I'd like to see it brought up to 0.5 support. Contact me directly and I will do what I can to help steer your volunteer in the right direction.

Friends from a company I'm working in, creators of Mockito, a mocking library for Java, have started development of Python version of this library but don't have time to continue and are looking for help:

http://code.google.com/p/mockito/

Another interesting project could be WebDriver, probably the code base for Selenium 2.0. There are Python bindings on the TODO list, but I seems that nobody is working on them.